The Index · Cationic emulsifier / conditioning agent
Behentrimonium Methosulfate
Behentrimonium Methosulfate
Mild cationic quaternary used to emulsify and condition skin/hair creams.
FunctionalFunctional ingredient, not graded for skin benefits
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Mild cationic quaternary used to emulsify and condition skin/hair creams.
What it does
Helps deposit fatty alcohols and ceramides for soft afterfeel.
The evidence
Functional ingredient (not graded for skin benefits): CIR-reviewed alkyl trimethyl ammonium salts family. Credible chemical identity and cosmetic-use context come from CIR/SCCS/manufacturer INCI definitions and databases such as SpecialChem/PubChem[1].
How to use it
Expect this as a supporting INCI line item unless labeled as a featured active.
What it does in the formula
Functional ingredient — not graded for skin benefits
Mild cationic quaternary used to emulsify and condition skin/hair creams.[1]
Safety & limits
Source and region, always
all — Used in cosmetics within conventional leave-on/rinse-off levels; see cited safety literature.[1] CA US EU UK
Sources · 2
Numbered as cited in the text
- [1]Cosmetic Ingredient Review. Alkyl Trimethyl Ammonium compounds. CIR (2012)regulator
- [2]SpecialChem. SpecialChem INCI profile: Behentrimonium Methosulfate. SpecialChem (2024)other
Revision history
18 Sept 2026Drafted by botTheSkindex Desk